Get Cookie Value From Javascript ??

function getCookie(cookiename)
  {
  // Get name followed by anything except a semicolon
  var cookiestring=RegExp(""+cookiename+"[^;]+").exec(document.cookie);
  // Return everything after the equal sign
  return unescape(!!cookiestring ? cookiestring.toString().replace(/^[^=]+/,"").replace("=","") : "");
  }

var myCookie = getCook('cookieName');